145 lines
4.2 KiB
C++
145 lines
4.2 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.3
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// SVG path tokenizer.
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//
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//----------------------------------------------------------------------------
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "agg_svg_exception.h"
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#include "agg_svg_path_tokenizer.h"
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namespace agg
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{
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namespace svg
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{
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//------------------------------------------------------------------------
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const char path_tokenizer::s_commands[] = "+-MmZzLlHhVvCcSsQqTtAaFfPp";
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const char path_tokenizer::s_numeric[] = ".Ee0123456789";
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const char path_tokenizer::s_separators[] = " ,\t\n\r";
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//------------------------------------------------------------------------
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path_tokenizer::path_tokenizer()
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: m_path(0), m_last_number(0.0), m_last_command(0)
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{
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init_char_mask(m_commands_mask, s_commands);
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init_char_mask(m_numeric_mask, s_numeric);
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init_char_mask(m_separators_mask, s_separators);
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}
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//------------------------------------------------------------------------
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void path_tokenizer::set_path_str(const char* str)
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{
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m_path = str;
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m_last_command = 0;
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m_last_number = 0.0;
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}
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//------------------------------------------------------------------------
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void path_tokenizer::init_char_mask(char* mask, const char* char_set)
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{
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memset(mask, 0, 256/8);
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while(*char_set)
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{
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unsigned c = unsigned(*char_set++) & 0xFF;
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mask[c >> 3] |= 1 << (c & 7);
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}
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}
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//------------------------------------------------------------------------
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bool path_tokenizer::next()
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{
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if(m_path == 0) return false;
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// Skip all white spaces and other garbage
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while(*m_path && !is_command(*m_path) && !is_numeric(*m_path))
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{
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if(!is_separator(*m_path))
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{
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char buf[100];
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sprintf(buf, "path_tokenizer::next : Invalid Character %c", *m_path);
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throw exception(buf);
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}
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m_path++;
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}
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if(*m_path == 0) return false;
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if(is_command(*m_path))
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{
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// Check if the command is a numeric sign character
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if(*m_path == '-' || *m_path == '+')
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{
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return parse_number();
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}
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m_last_command = *m_path++;
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while(*m_path && is_separator(*m_path)) m_path++;
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if(*m_path == 0) return true;
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}
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return parse_number();
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}
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//------------------------------------------------------------------------
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double path_tokenizer::next(char cmd)
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{
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if(!next()) throw exception("parse_path: Unexpected end of path");
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if(last_command() != cmd)
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{
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char buf[100];
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sprintf(buf, "parse_path: Command %c: bad or missing parameters", cmd);
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throw exception(buf);
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}
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return last_number();
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}
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//------------------------------------------------------------------------
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bool path_tokenizer::parse_number()
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{
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char buf[256]; // Should be enough for any number
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char* buf_ptr = buf;
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// Copy all sign characters
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while(buf_ptr < buf+255 && (*m_path == '-' || *m_path == '+'))
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{
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*buf_ptr++ = *m_path++;
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}
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// Copy all numeric characters
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while(buf_ptr < buf+255 && (is_numeric(*m_path)))
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{
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*buf_ptr++ = *m_path++;
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}
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*buf_ptr = 0;
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m_last_number = atof(buf);
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return true;
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}
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} //namespace svg
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} //namespace agg
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